We know Guy's that in order for us humans to get our food, we have to go to the supermarket to buy meat or fish, pick vegetables or fruit from our gardens. But did you know that a plant, however, makes its own food using sunlight as its major energy source. chemical process by which plants containing chlorophyll use sunlight to manufacture their own food by converting carbon dioxide and water to carbohydrates, releasing oxygen as plants are the only living things on earth that turn sunlight into food.They do it through a process called photosynthesis. Photosynthesis means "putting together using light". Plants use sunlight to turn carbon dioxide from the air, and water into food. Plants need all of these to remain healthy. Plants are attracted to light because through this energy they are able to transform their substance into nourishment.